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        </div><article class="page single"><h1 class="single-title animated flipInX">05_springmvc_handlerExceptionResolver</h1><div class="post-meta">
            <div class="post-meta-line"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>山脚下的脚下山</a></span>&nbsp;<span class="post-category">收录于 <a href="/categories/spring/"><i class="far fa-folder fa-fw"></i>spring</a></span></div>
            <div class="post-meta-line"><i class="far fa-calendar-alt fa-fw"></i>&nbsp;<time datetime="2016-11-01">2016-11-01</time>&nbsp;<i class="fas fa-pencil-alt fa-fw"></i>&nbsp;约 1848 字&nbsp;
                <i class="far fa-clock fa-fw"></i>&nbsp;预计阅读 4 分钟&nbsp;<span id="/05_springmvc_handlerexceptionresolver/" class="leancloud_visitors" data-flag-title="05_springmvc_handlerExceptionResolver">
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                <div class="details-content toc-content" id="toc-content-static"><nav id="TableOfContents">
  <ul>
    <li><a href="#初始化">初始化</a></li>
    <li><a href="#处理逻辑">处理逻辑</a>
      <ul>
        <li><a href="#exceptionhandlermethodresolver">ExceptionHandlerMethodResolver</a>
          <ul>
            <li><a href="#initializationbean">@InitializationBean</a></li>
          </ul>
        </li>
      </ul>
    </li>
  </ul>
</nav></div>
            </div><div class="content" id="content"><h1 id="handlerexceptionresolver">HandlerExceptionResolver</h1>
<blockquote>
<p>Spring的处理器异常解析器<code>HandlerExceptionResolver</code>接口的实现负责处理各类控制器执行过程中出现的异常</p>
</blockquote>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">HandlerExceptionResolver</span> <span class="o">{</span>
   <span class="nd">@Nullable</span>
   <span class="n">ModelAndView</span> <span class="nf">resolveException</span><span class="o">(</span>
         <span class="n">HttpServletRequest</span> <span class="n">request</span><span class="o">,</span> <span class="n">HttpServletResponse</span> <span class="n">response</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">Object</span> <span class="n">handler</span><span class="o">,</span> <span class="n">Exception</span> <span class="n">ex</span><span class="o">);</span>
<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h2 id="初始化">初始化</h2>
<p>初始化过程比较简单，在<code>DispatcherServlet</code>类<code>initStrategies</code>方法中调用<code>initHandlerExceptionResolvers</code>获取所有实现了<code>HandlerExceptionResolver</code>接口的实例</p>
<p><img
        class="lazyload"
        src="/svg/loading.min.svg"
        data-src="https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-21/18:31:58/image-20200721183147936.png"
        data-srcset="https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-21/18:31:58/image-20200721183147936.png, https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-21/18:31:58/image-20200721183147936.png 1.5x, https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-21/18:31:58/image-20200721183147936.png 2x"
        data-sizes="auto"
        alt="https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-21/18:31:58/image-20200721183147936.png"
        title="image-20200721183147936" /></p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="cm">/**
</span><span class="cm"> * Initialize the HandlerExceptionResolver used by this class.
</span><span class="cm"> * &lt;p&gt;If no bean is defined with the given name in the BeanFactory for this namespace,
</span><span class="cm"> * we default to no exception resolver.
</span><span class="cm"> */</span>
<span class="kd">private</span> <span class="kt">void</span> <span class="nf">initHandlerExceptionResolvers</span><span class="o">(</span><span class="n">ApplicationContext</span> <span class="n">context</span><span class="o">)</span> <span class="o">{</span>
   <span class="k">this</span><span class="o">.</span><span class="na">handlerExceptionResolvers</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>

   <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">detectAllHandlerExceptionResolvers</span><span class="o">)</span> <span class="o">{</span>
      <span class="c1">// Find all HandlerExceptionResolvers in the ApplicationContext, including ancestor contexts.
</span><span class="c1"></span>      <span class="c1">// 找到所有实现了HandlerExceptionResolver接口
</span><span class="c1"></span>      <span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">HandlerExceptionResolver</span><span class="o">&gt;</span> <span class="n">matchingBeans</span> <span class="o">=</span> <span class="n">BeanFactoryUtils</span>
            <span class="o">.</span><span class="na">beansOfTypeIncludingAncestors</span><span class="o">(</span><span class="n">context</span><span class="o">,</span> <span class="n">HandlerExceptionResolver</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">false</span><span class="o">);</span>
      <span class="k">if</span> <span class="o">(!</span><span class="n">matchingBeans</span><span class="o">.</span><span class="na">isEmpty</span><span class="o">())</span> <span class="o">{</span>
         <span class="k">this</span><span class="o">.</span><span class="na">handlerExceptionResolvers</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;(</span><span class="n">matchingBeans</span><span class="o">.</span><span class="na">values</span><span class="o">());</span>
         <span class="c1">// We keep HandlerExceptionResolvers in sorted order.
</span><span class="c1"></span>         <span class="n">AnnotationAwareOrderComparator</span><span class="o">.</span><span class="na">sort</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">handlerExceptionResolvers</span><span class="o">);</span>
      <span class="o">}</span>
   <span class="o">}</span>
   <span class="k">else</span> <span class="o">{</span>
      <span class="k">try</span> <span class="o">{</span>
         <span class="n">HandlerExceptionResolver</span> <span class="n">her</span> <span class="o">=</span>
               <span class="n">context</span><span class="o">.</span><span class="na">getBean</span><span class="o">(</span><span class="n">HANDLER_EXCEPTION_RESOLVER_BEAN_NAME</span><span class="o">,</span> <span class="n">HandlerExceptionResolver</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
         <span class="k">this</span><span class="o">.</span><span class="na">handlerExceptionResolvers</span> <span class="o">=</span> <span class="n">Collections</span><span class="o">.</span><span class="na">singletonList</span><span class="o">(</span><span class="n">her</span><span class="o">);</span>
      <span class="o">}</span>
      <span class="k">catch</span> <span class="o">(</span><span class="n">NoSuchBeanDefinitionException</span> <span class="n">ex</span><span class="o">)</span> <span class="o">{</span>
         <span class="c1">// Ignore, no HandlerExceptionResolver is fine too.
</span><span class="c1"></span>      <span class="o">}</span>
   <span class="o">}</span>

   <span class="c1">// Ensure we have at least some HandlerExceptionResolvers, by registering
</span><span class="c1"></span>   <span class="c1">// default HandlerExceptionResolvers if no other resolvers are found.
</span><span class="c1"></span>   <span class="c1">// 获取默认的异常解析器
</span><span class="c1"></span>   <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">handlerExceptionResolvers</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
      <span class="k">this</span><span class="o">.</span><span class="na">handlerExceptionResolvers</span> <span class="o">=</span> <span class="n">getDefaultStrategies</span><span class="o">(</span><span class="n">context</span><span class="o">,</span> <span class="n">HandlerExceptionResolver</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
      <span class="k">if</span> <span class="o">(</span><span class="n">logger</span><span class="o">.</span><span class="na">isTraceEnabled</span><span class="o">())</span> <span class="o">{</span>
         <span class="n">logger</span><span class="o">.</span><span class="na">trace</span><span class="o">(</span><span class="s">&#34;No HandlerExceptionResolvers declared in servlet &#39;&#34;</span> <span class="o">+</span> <span class="n">getServletName</span><span class="o">()</span> <span class="o">+</span>
               <span class="s">&#34;&#39;: using default strategies from DispatcherServlet.properties&#34;</span><span class="o">);</span>
      <span class="o">}</span>
   <span class="o">}</span>
<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h2 id="处理逻辑">处理逻辑</h2>
<p>在处理请求过程中，当发生了异常，被try&hellip;catch抓到之后，赋值给了<code>dispatchException</code>变量，然后在<code>processDispatchResult</code>方法中，判断exception是否为空，非空即表示存在异常，调用异常处理解析器（方法：<code>processHandlerException</code>）处理异常，返回ModelAndView</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="kd">private</span> <span class="kt">void</span> <span class="nf">processDispatchResult</span><span class="o">(</span><span class="n">HttpServletRequest</span> <span class="n">request</span><span class="o">,</span> <span class="n">HttpServletResponse</span> <span class="n">response</span><span class="o">,</span>
      <span class="nd">@Nullable</span> <span class="n">HandlerExecutionChain</span> <span class="n">mappedHandler</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">ModelAndView</span> <span class="n">mv</span><span class="o">,</span>
      <span class="nd">@Nullable</span> <span class="n">Exception</span> <span class="n">exception</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Exception</span> <span class="o">{</span>

   <span class="kt">boolean</span> <span class="n">errorView</span> <span class="o">=</span> <span class="kc">false</span><span class="o">;</span>

   <span class="k">if</span> <span class="o">(</span><span class="n">exception</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
      <span class="k">if</span> <span class="o">(</span><span class="n">exception</span> <span class="k">instanceof</span> <span class="n">ModelAndViewDefiningException</span><span class="o">)</span> <span class="o">{</span>
         <span class="n">logger</span><span class="o">.</span><span class="na">debug</span><span class="o">(</span><span class="s">&#34;ModelAndViewDefiningException encountered&#34;</span><span class="o">,</span> <span class="n">exception</span><span class="o">);</span>
         <span class="n">mv</span> <span class="o">=</span> <span class="o">((</span><span class="n">ModelAndViewDefiningException</span><span class="o">)</span> <span class="n">exception</span><span class="o">).</span><span class="na">getModelAndView</span><span class="o">();</span>
      <span class="o">}</span>
      <span class="k">else</span> <span class="o">{</span>
         <span class="n">Object</span> <span class="n">handler</span> <span class="o">=</span> <span class="o">(</span><span class="n">mappedHandler</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">?</span> <span class="n">mappedHandler</span><span class="o">.</span><span class="na">getHandler</span><span class="o">()</span> <span class="o">:</span> <span class="kc">null</span><span class="o">);</span>
         <span class="c1">// 处理异常
</span><span class="c1"></span>         <span class="n">mv</span> <span class="o">=</span> <span class="n">processHandlerException</span><span class="o">(</span><span class="n">request</span><span class="o">,</span> <span class="n">response</span><span class="o">,</span> <span class="n">handler</span><span class="o">,</span> <span class="n">exception</span><span class="o">);</span>
         <span class="n">errorView</span> <span class="o">=</span> <span class="o">(</span><span class="n">mv</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">);</span>
      <span class="o">}</span>
   <span class="o">}</span>

   <span class="c1">// Did the handler return a view to render?
</span><span class="c1"></span>   <span class="k">if</span> <span class="o">(</span><span class="n">mv</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">&amp;&amp;</span> <span class="o">!</span><span class="n">mv</span><span class="o">.</span><span class="na">wasCleared</span><span class="o">())</span> <span class="o">{</span>
      <span class="n">render</span><span class="o">(</span><span class="n">mv</span><span class="o">,</span> <span class="n">request</span><span class="o">,</span> <span class="n">response</span><span class="o">);</span>
      <span class="k">if</span> <span class="o">(</span><span class="n">errorView</span><span class="o">)</span> <span class="o">{</span>
         <span class="n">WebUtils</span><span class="o">.</span><span class="na">clearErrorRequestAttributes</span><span class="o">(</span><span class="n">request</span><span class="o">);</span>
      <span class="o">}</span>
   <span class="o">}</span>
   <span class="o">...</span><span class="na">省略</span>
<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><p>处理异常</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="kd">protected</span> <span class="n">ModelAndView</span> <span class="nf">processHandlerException</span><span class="o">(</span><span class="n">HttpServletRequest</span> <span class="n">request</span><span class="o">,</span> <span class="n">HttpServletResponse</span> <span class="n">response</span><span class="o">,</span>
      <span class="nd">@Nullable</span> <span class="n">Object</span> <span class="n">handler</span><span class="o">,</span> <span class="n">Exception</span> <span class="n">ex</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Exception</span> <span class="o">{</span>
	 <span class="o">...</span> <span class="n">省略</span>
   <span class="c1">// Check registered HandlerExceptionResolvers...
</span><span class="c1"></span>   <span class="n">ModelAndView</span> <span class="n">exMv</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
   <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">handlerExceptionResolvers</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
      <span class="k">for</span> <span class="o">(</span><span class="n">HandlerExceptionResolver</span> <span class="n">resolver</span> <span class="o">:</span> <span class="k">this</span><span class="o">.</span><span class="na">handlerExceptionResolvers</span><span class="o">)</span> <span class="o">{</span>
        <span class="c1">// 调用异常处理解析器处理异常
</span><span class="c1"></span>         <span class="n">exMv</span> <span class="o">=</span> <span class="n">resolver</span><span class="o">.</span><span class="na">resolveException</span><span class="o">(</span><span class="n">request</span><span class="o">,</span> <span class="n">response</span><span class="o">,</span> <span class="n">handler</span><span class="o">,</span> <span class="n">ex</span><span class="o">);</span>
         <span class="k">if</span> <span class="o">(</span><span class="n">exMv</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
            <span class="k">break</span><span class="o">;</span>
         <span class="o">}</span>
      <span class="o">}</span>
   <span class="o">}</span>
   <span class="o">...</span><span class="na">省略</span>
   <span class="k">throw</span> <span class="n">ex</span><span class="o">;</span>
<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h3 id="exceptionhandlermethodresolver">ExceptionHandlerMethodResolver</h3>
<blockquote>
<p>异常解析器中默认最常用的，也是工作中使用最多的，就是该类。主要处理<code>@ExceptionHandler</code>注解</p>
</blockquote>
<p>该类继承和实现的接口如下图：</p>
<p><img
        class="lazyload"
        src="/svg/loading.min.svg"
        data-src="https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-25/14:25:07-image-20200725142446281.png"
        data-srcset="https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-25/14:25:07-image-20200725142446281.png, https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-25/14:25:07-image-20200725142446281.png 1.5x, https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-25/14:25:07-image-20200725142446281.png 2x"
        data-sizes="auto"
        alt="https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-25/14:25:07-image-20200725142446281.png"
        title="image-20200725142446281" /></p>
<p>由上图可知，该类主要实现了HandlerExeptionResolver用于解析异常，并且实现了<code>@InitializationBean</code>接口。</p>
<h4 id="initializationbean">@InitializationBean</h4>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="nd">@Override</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">afterPropertiesSet</span><span class="o">()</span> <span class="o">{</span>
  <span class="c1">// Do this first, it may add ResponseBodyAdvice beans
</span><span class="c1"></span>  <span class="c1">// ①
</span><span class="c1"></span>  <span class="n">initExceptionHandlerAdviceCache</span><span class="o">();</span>
  <span class="c1">// ②
</span><span class="c1"></span>  <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">argumentResolvers</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
    <span class="n">List</span><span class="o">&lt;</span><span class="n">HandlerMethodArgumentResolver</span><span class="o">&gt;</span> <span class="n">resolvers</span> <span class="o">=</span> <span class="n">getDefaultArgumentResolvers</span><span class="o">();</span>
    <span class="k">this</span><span class="o">.</span><span class="na">argumentResolvers</span> <span class="o">=</span> <span class="k">new</span> <span class="n">HandlerMethodArgumentResolverComposite</span><span class="o">().</span><span class="na">addResolvers</span><span class="o">(</span><span class="n">resolvers</span><span class="o">);</span>
  <span class="o">}</span>
  <span class="c1">// ③
</span><span class="c1"></span>  <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">returnValueHandlers</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
    <span class="n">List</span><span class="o">&lt;</span><span class="n">HandlerMethodReturnValueHandler</span><span class="o">&gt;</span> <span class="n">handlers</span> <span class="o">=</span> <span class="n">getDefaultReturnValueHandlers</span><span class="o">();</span>
    <span class="k">this</span><span class="o">.</span><span class="na">returnValueHandlers</span> <span class="o">=</span> <span class="k">new</span> <span class="n">HandlerMethodReturnValueHandlerComposite</span><span class="o">().</span><span class="na">addHandlers</span><span class="o">(</span><span class="n">handlers</span><span class="o">);</span>
  <span class="o">}</span>
<span class="o">}</span>

</code></pre></td></tr></table>
</div>
</div><p>① 、遍历所有标注了<code>ControllerAdvice</code>的类，并从标注了该注解的类下找到所有标注了<code>@ExceptionHandler</code>的方法。具体代码如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="kd">private</span> <span class="kt">void</span> <span class="nf">initExceptionHandlerAdviceCache</span><span class="o">()</span> <span class="o">{</span>
	<span class="o">...</span> <span class="n">省略</span>
  <span class="c1">// 遍历Spring上下文，找出所有@ControllerAdvice的Bean
</span><span class="c1"></span>  <span class="n">List</span><span class="o">&lt;</span><span class="n">ControllerAdviceBean</span><span class="o">&gt;</span> <span class="n">adviceBeans</span> <span class="o">=</span> <span class="n">ControllerAdviceBean</span><span class="o">.</span><span class="na">findAnnotatedBeans</span><span class="o">(</span><span class="n">getApplicationContext</span><span class="o">());</span>
  <span class="k">for</span> <span class="o">(</span><span class="n">ControllerAdviceBean</span> <span class="n">adviceBean</span> <span class="o">:</span> <span class="n">adviceBeans</span><span class="o">)</span> <span class="o">{</span>
    <span class="n">Class</span><span class="o">&lt;?&gt;</span> <span class="n">beanType</span> <span class="o">=</span> <span class="n">adviceBean</span><span class="o">.</span><span class="na">getBeanType</span><span class="o">();</span>
    <span class="k">if</span> <span class="o">(</span><span class="n">beanType</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
      <span class="k">throw</span> <span class="k">new</span> <span class="n">IllegalStateException</span><span class="o">(</span><span class="s">&#34;Unresolvable type for ControllerAdviceBean: &#34;</span> <span class="o">+</span> <span class="n">adviceBean</span><span class="o">);</span>
    <span class="o">}</span>
    <span class="c1">// 循环所有@ControllerAdvice的Bean，构造ExceptionHandlerMethodResolver实例用于缓存处理异常的方法
</span><span class="c1"></span>    <span class="n">ExceptionHandlerMethodResolver</span> <span class="n">resolver</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ExceptionHandlerMethodResolver</span><span class="o">(</span><span class="n">beanType</span><span class="o">);</span>
    <span class="c1">// 如果该@ControllerAdvice中没有@ExceptionHandler，则丢弃刚new的实例
</span><span class="c1"></span>    <span class="k">if</span> <span class="o">(</span><span class="n">resolver</span><span class="o">.</span><span class="na">hasExceptionMappings</span><span class="o">())</span> <span class="o">{</span>
      <span class="k">this</span><span class="o">.</span><span class="na">exceptionHandlerAdviceCache</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">adviceBean</span><span class="o">,</span> <span class="n">resolver</span><span class="o">);</span>
    <span class="o">}</span>
    <span class="c1">// 如果标注了@ControllerAdvice的类实现了ResponseBodyAdvice，放到responseBodyAdvice属性中
</span><span class="c1"></span>    <span class="k">if</span> <span class="o">(</span><span class="n">ResponseBodyAdvice</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">isAssignableFrom</span><span class="o">(</span><span class="n">beanType</span><span class="o">))</span> <span class="o">{</span>
      <span class="k">this</span><span class="o">.</span><span class="na">responseBodyAdvice</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">adviceBean</span><span class="o">);</span>
    <span class="o">}</span>
  <span class="o">}</span>
	<span class="o">...</span> <span class="n">省略</span>
<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><p>②、获取异常处理解析器中，用于<code>异常处理方法</code>的<code>参数解析器</code></p>
<p>③、获取异常处理解析器中，用于<code>异常处理方法</code>的<code>返回值解析器</code></p>
<p>接下来的流程和HandlerAdapter的处理逻辑差不多</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="nd">@Override</span>
<span class="nd">@Nullable</span>
<span class="kd">protected</span> <span class="n">ModelAndView</span> <span class="nf">doResolveHandlerMethodException</span><span class="o">(</span><span class="n">HttpServletRequest</span> <span class="n">request</span><span class="o">,</span>
                                                       <span class="n">HttpServletResponse</span> <span class="n">response</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">HandlerMethod</span> <span class="n">handlerMethod</span><span class="o">,</span> <span class="n">Exception</span> <span class="n">exception</span><span class="o">)</span> <span class="o">{</span>
	<span class="c1">// 获取异常处理方法
</span><span class="c1"></span>  <span class="n">ServletInvocableHandlerMethod</span> <span class="n">exceptionHandlerMethod</span> <span class="o">=</span> <span class="n">getExceptionHandlerMethod</span><span class="o">(</span><span class="n">handlerMethod</span><span class="o">,</span> <span class="n">exception</span><span class="o">);</span>
  <span class="k">if</span> <span class="o">(</span><span class="n">exceptionHandlerMethod</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
    <span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
  <span class="o">}</span>
	<span class="c1">// 设置异常处理方法的参数解析器
</span><span class="c1"></span>  <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">argumentResolvers</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
    <span class="n">exceptionHandlerMethod</span><span class="o">.</span><span class="na">setHandlerMethodArgumentResolvers</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">argumentResolvers</span><span class="o">);</span>
  <span class="o">}</span>
  <span class="c1">// 设置异常处理方法的返回值解析器
</span><span class="c1"></span>  <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">returnValueHandlers</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
    <span class="n">exceptionHandlerMethod</span><span class="o">.</span><span class="na">setHandlerMethodReturnValueHandlers</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">returnValueHandlers</span><span class="o">);</span>
  <span class="o">}</span>

  <span class="n">ServletWebRequest</span> <span class="n">webRequest</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ServletWebRequest</span><span class="o">(</span><span class="n">request</span><span class="o">,</span> <span class="n">response</span><span class="o">);</span>
  <span class="n">ModelAndViewContainer</span> <span class="n">mavContainer</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ModelAndViewContainer</span><span class="o">();</span>

  <span class="k">try</span> <span class="o">{</span>
    <span class="k">if</span> <span class="o">(</span><span class="n">logger</span><span class="o">.</span><span class="na">isDebugEnabled</span><span class="o">())</span> <span class="o">{</span>
      <span class="n">logger</span><span class="o">.</span><span class="na">debug</span><span class="o">(</span><span class="s">&#34;Using @ExceptionHandler &#34;</span> <span class="o">+</span> <span class="n">exceptionHandlerMethod</span><span class="o">);</span>
    <span class="o">}</span>
    <span class="n">Throwable</span> <span class="n">cause</span> <span class="o">=</span> <span class="n">exception</span><span class="o">.</span><span class="na">getCause</span><span class="o">();</span>
    <span class="k">if</span> <span class="o">(</span><span class="n">cause</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
      <span class="c1">// Expose cause as provided argument as well
</span><span class="c1"></span>      <span class="c1">// 调用异常解析方法
</span><span class="c1"></span>      <span class="n">exceptionHandlerMethod</span><span class="o">.</span><span class="na">invokeAndHandle</span><span class="o">(</span><span class="n">webRequest</span><span class="o">,</span> <span class="n">mavContainer</span><span class="o">,</span> <span class="n">exception</span><span class="o">,</span> <span class="n">cause</span><span class="o">,</span> <span class="n">handlerMethod</span><span class="o">);</span>
    <span class="o">}</span>
    <span class="k">else</span> <span class="o">{</span>
      <span class="c1">// Otherwise, just the given exception as-is
</span><span class="c1"></span>      <span class="c1">// 调用异常解析方法
</span><span class="c1"></span>      <span class="n">exceptionHandlerMethod</span><span class="o">.</span><span class="na">invokeAndHandle</span><span class="o">(</span><span class="n">webRequest</span><span class="o">,</span> <span class="n">mavContainer</span><span class="o">,</span> <span class="n">exception</span><span class="o">,</span> <span class="n">handlerMethod</span><span class="o">);</span>
    <span class="o">}</span>
  <span class="o">}</span>
  <span class="k">catch</span> <span class="o">(</span><span class="n">Throwable</span> <span class="n">invocationEx</span><span class="o">)</span> <span class="o">{</span>
    <span class="c1">// Any other than the original exception (or its cause) is unintended here,
</span><span class="c1"></span>    <span class="c1">// probably an accident (e.g. failed assertion or the like).
</span><span class="c1"></span>    <span class="k">if</span> <span class="o">(</span><span class="n">invocationEx</span> <span class="o">!=</span> <span class="n">exception</span> <span class="o">&amp;&amp;</span> <span class="n">invocationEx</span> <span class="o">!=</span> <span class="n">exception</span><span class="o">.</span><span class="na">getCause</span><span class="o">()</span> <span class="o">&amp;&amp;</span> <span class="n">logger</span><span class="o">.</span><span class="na">isWarnEnabled</span><span class="o">())</span> <span class="o">{</span>
      <span class="n">logger</span><span class="o">.</span><span class="na">warn</span><span class="o">(</span><span class="s">&#34;Failure in @ExceptionHandler &#34;</span> <span class="o">+</span> <span class="n">exceptionHandlerMethod</span><span class="o">,</span> <span class="n">invocationEx</span><span class="o">);</span>
    <span class="o">}</span>
    <span class="c1">// Continue with default processing of the original exception...
</span><span class="c1"></span>    <span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
  <span class="o">}</span>

  <span class="k">if</span> <span class="o">(</span><span class="n">mavContainer</span><span class="o">.</span><span class="na">isRequestHandled</span><span class="o">())</span> <span class="o">{</span>
    <span class="k">return</span> <span class="k">new</span> <span class="n">ModelAndView</span><span class="o">();</span>
  <span class="o">}</span>
  <span class="k">else</span> <span class="o">{</span>
    <span class="n">ModelMap</span> <span class="n">model</span> <span class="o">=</span> <span class="n">mavContainer</span><span class="o">.</span><span class="na">getModel</span><span class="o">();</span>
    <span class="n">HttpStatus</span> <span class="n">status</span> <span class="o">=</span> <span class="n">mavContainer</span><span class="o">.</span><span class="na">getStatus</span><span class="o">();</span>
    <span class="n">ModelAndView</span> <span class="n">mav</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ModelAndView</span><span class="o">(</span><span class="n">mavContainer</span><span class="o">.</span><span class="na">getViewName</span><span class="o">(),</span> <span class="n">model</span><span class="o">,</span> <span class="n">status</span><span class="o">);</span>
    <span class="n">mav</span><span class="o">.</span><span class="na">setViewName</span><span class="o">(</span><span class="n">mavContainer</span><span class="o">.</span><span class="na">getViewName</span><span class="o">());</span>
    <span class="k">if</span> <span class="o">(!</span><span class="n">mavContainer</span><span class="o">.</span><span class="na">isViewReference</span><span class="o">())</span> <span class="o">{</span>
      <span class="n">mav</span><span class="o">.</span><span class="na">setView</span><span class="o">((</span><span class="n">View</span><span class="o">)</span> <span class="n">mavContainer</span><span class="o">.</span><span class="na">getView</span><span class="o">());</span>
    <span class="o">}</span>
    <span class="k">if</span> <span class="o">(</span><span class="n">model</span> <span class="k">instanceof</span> <span class="n">RedirectAttributes</span><span class="o">)</span> <span class="o">{</span>
      <span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?&gt;</span> <span class="n">flashAttributes</span> <span class="o">=</span> <span class="o">((</span><span class="n">RedirectAttributes</span><span class="o">)</span> <span class="n">model</span><span class="o">).</span><span class="na">getFlashAttributes</span><span class="o">();</span>
      <span class="n">RequestContextUtils</span><span class="o">.</span><span class="na">getOutputFlashMap</span><span class="o">(</span><span class="n">request</span><span class="o">).</span><span class="na">putAll</span><span class="o">(</span><span class="n">flashAttributes</span><span class="o">);</span>
    <span class="o">}</span>
    <span class="k">return</span> <span class="n">mav</span><span class="o">;</span>
  <span class="o">}</span>
<span class="o">}</span>
</code></pre></td></tr></table>
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